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Subject[PATCH] mm/vmalloc: fix unsafe dereference of potential null ptr in vmalloc_init()
Date
Return value of a function 'kmem_cache_create' is dereferenced 
at vmalloc.c:2444 without checking for null, but it is usually
checked for this function.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Alexander Sapozhnikov <alsp705@gmail.com>
---
mm/vmalloc.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index ca71de7c9d77..ed75dfd44b85 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2426,6 +2426,8 @@ void __init vmalloc_init(void)
* Create the cache for vmap_area objects.
*/
vmap_area_cachep = KMEM_CACHE(vmap_area, SLAB_PANIC);
+ if (!vmap_area_cachep)
+ return;

for_each_possible_cpu(i) {
struct vmap_block_queue *vbq;
--
2.34.1
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